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Motor oil leakage protection structureRelated Patent Categories: Bearings, Rotary Bearing, Fluid BearingMotor oil leakage protection structure description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070071374, Motor oil leakage protection structure. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The invention relates to a motor oil leakage protection structure, which is designed to protect lubricating oil from leaking and draining against the attrition of the spindle and the bearing of the motor, making the motor more durable. BACKGROUND OF THE INVENTION [0002] When the spindle is rotating with respect to the bearing, lubricating oil is the lubricating medium to reduce the attrition therebetween. Therefore, how to protect lubricating oil from leaking is the major subject for settling attrition. [0003] As shown in FIG. 1, the motor structure includes a motor 10 and a stator 20, wherein the rotor 10 has a spindle 11, a shaft tube 30 is sleeved by the stator 20, the shaft tube 30 contains a bearing 40 therein, the bearing 40 is clamped at a predetermined position between a locating ring 50 and a cap 60, and a snap ring 12 is clamped between the cap 60 and the bearing 40. Therefore, the spindle 11 of the rotor 10 penetrates through the bearing 40, rotates therein and is fixed by the snap ring 12 to prevent the rotor 10 from falling off. Practically, the leakage and drainage of the lubricating oil are critical to the life cycle of motor. After the lubricating oil inside the cap 60 is churned by the spindle 11, the lubricating oil will keep seeping out upwardly from the gap between the bearing 40 and the inner wall of the shaft tube 30 throughout the circulation process of the lubricating oil. [0004] Consequently, the invention targets at the leakage issue of the lubricating oil between the bearing 40 and the inner wall of the shaft tube for sake of further development and enhancement. [0005] Together with the reference to FIG. 2, the inner wall of the conventional motor shaft tube 30 takes the shape of a single-hole penetration pattern. According, after the lubricating oil within an oil storage room 61 is churned by the spindle 11, the lubricating oil keeps rising up along the inner wall of the shaft and the gap between the inner wall of the shaft tube 30 and the bearing 40a and swiftly seeps out from the gap between the inner wall of the shaft tube 30 and the locating ring 40, resulting in the drainage of the lubricating oil. [0006] As such, for sake of preventing the attrition between the spindle 11 and the bearing 40 intended to prolong the life cycle of the motor, it is essential to solve the leakage issue of the aforementioned lubricating oil. SUMMARY OF THE INVENTION [0007] In view of the above, the present invention brings up a motor oil leakage protection structure including a rotor having a spindle, a stator sheathed on a shaft tube, wherein at least two cascaded holes with different inner diameters are formed on the inner wall of the shaft tube, the hole with smaller inner diameter is disposed a bearing while the hole with larger inner diameter is disposed a locating ring, and the locating ring isolates the top edge of the gap between the hole with smaller inner diameter and the bearing to obstruct the oil path that the lubricating oil keeps rising up. [0008] Therefore, when the lubricating oil keeps rising up along the gap between the hole with smaller inner diameter of the shaft tube and the bearing, the blockage posed on the oil path slows down the rising speed of the lubricating oil so that the lubricating oil is further absorbed and utilized by the bearing during circulation to effectively prevent the lubricating oil from draining. BRIEF DESCRIPTION OF THE DRAWINGS [0009] FIG. 1 is a cross-sectional schematic view showing the entire conventional motor structure; [0010] FIG. 2 is an enlarged partial schematic view showing the conventional motor structure; [0011] FIG. 3 is a cross-sectional schematic view showing the first preferred embodiment; [0012] FIG. 4 is an enlarged partial schematic view of the first preferred embodiment; and [0013] FIG. 5 is a cross-sectional schematic view of the second preferred embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT [0014] The invention relates to a motor oil leakage protection structure, which at least two cascaded holes with different inner diameters are formed on the inner wall of the shaft tube, and a bearing and a locating ring are disposed in these holes with different inner diameters so that the locating ring blocks the oil path that the lubricating oil rises up to prevent the lubricating oil from draining. [0015] Take few preferred embodiments as examples illustrative of the relevant position of respective part in the present invention; [0016] Please refer to FIG. 3. The motor structure includes a rotor 10 having a spindle 11, a stator 20 disposed on a shaft tube 30, wherein the shaft tube 30 is orderly disposed a locating ring 50, a bearing 40, a snap ring 12 and a cap 60, the inner wall of the shaft tube 30 is formed at least two cascaded holes with different inner diameters where the bearing 40, the snap ring 12 and the cap 60 are located in the hole with smaller inner diameter 31 and the locating ring 50 is located in the hole with larger inner diameter, and the locating ring 50 exactly isolates the top edge of the gap between the hole with smaller inner diameter 31 and the bearing 40 to obstruct the oil path that the lubricating oil keeps rising up and to prevent the lubricating oil from draining. [0017] Together with the reference to FIG. 4, when the lubricating oil inside the oil containing room 61 of the cap 60 is churned by the spindle 11, the lubricating oil flows through the gap between the hole of the shaft tube 30 with smaller inner diameter 31 and the bearing 40 and keeps rising up. When rising to the top edge of the gap, as a result of the obstruction to the oil path, the locating ring 50 blocks and lessens the rising speed of the lubricating oil so that the lubricating oil can be further absorbed and utilized repeatedly by the bearing 40 and the drainage of the lubricating oil can be effectively avoided. [0018] In addition, the invention can be one of the following preferred embodiments; [0019] As shown in FIG. 4, the inner wall of the of the shaft tube 30 is formed two cascaded holes with different inner diameters, where the bearing 40, the snap ring 12 and the cap 60 are all located in the hole with smaller inner diameter 31 of the shaft tube 30, and the locating ring 50 is located in the hole with larger inner diameter 32 of the shaft tube 30. The top side of the bearing 40 is higher than the place where two cascaded holes neighbor each other, so as to form another oil containing room 34 between the bearing 40 and the locating ring 50. Continue reading about Motor oil leakage protection structure... 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